Well, the rear-gear ratio calculation IS important, as the D500-1's
reportedly had to run 4.56 &/or 4.89 gears
in order to be allowed to get down the 1/4 mile using only one gear shift.
So, to validate the D500-1's performance, back in the real world, we
need to have the program consider those
particular rear end ratios!!
Neil Vedder
William Huff wrote:
Hi Neil,
It could only make a difference for the two programs that display the
final gear ratio, since they are the ones that have the diameter
input. The E.T. and speed calculations are not affected by tire
diameter in these free and simplistic programs, I already tried that,
it is only used for the final gear ratio calculation. I just left it
alone after that. The links are supplied if anyone wants to input
their own figures.
Bill
At 11/9/200707:14 PM, you wrote:
Bill. I'm just getting caught up on messages---for your research, can
you input 28" tires, instead of 32" tires (for what-ever difference
THAT will make, one-way-or-the-other!!!!
Neil
William Huff wrote:
Hi Neil,
I have gone through 4 different calculators and input HP of 150, 170
and 190. Body weights of 3400, 3500, 3600 , 3700, 3800 and 3900 lbs.
All the quarter mile speeds are amazingly close. The E.T.s are also
very close on 3 of the calculators and within about 12/ second on
the other. Problem is the only way I could keep the formatting was
as Word tables. My email program won't use tables or keep tab
formatting very well. I am enclosing it as an attachment, if you
want to put it somewhere that interested parties could look you are
welcome.
At the beginning of the table sheet I have included a site that
shows dyno testing with rear wheel HP and estimated flywheel HP.
Very interesting and it would be astonishing to me if the technology
of the 50's could equal even that of the late 60's, since Chrysler
was actively developing new drag race engines and technologies in
the late 50's and early to mid 60s. It puts some doubts on the real
HP developed by the earlier engines.
Anyway, here it is for whatever it is worth. The discussion has
been lively and informing even if everyone couldn't always be right
at the same time. :-D
Regards,
Bill
At 11/7/200703:30 PM, you wrote:
DAYUUM, Bill!
I MUST have overlooked this message, to the List, earlier!!!!!!!
I'm @ the office, now, reading the posts to the List.
Could you kindly go back to the List & SHOUT-OUT this message, in
all-capitals???
Also, maybe display varying results, from 3400 lbs @ 175HP,
("best-case" scenario, for the D500-1) down thru 3800 lbs @ 150HP
(worst-case scenario, for D500-1's ) ???
You might recall that the D500-1, in the Standing MILE (on the
hard-sand) recorded 81 mph......I'm curious if there are any other
combinations of wt/HP that can produce 1/4 mile times of from
14.8-ish, through 15.8-ish...
Thank you!
Neil
William Huff wrote:
I went here and did some calculations.
http://www.nationaldrivetrain.com/calcs/dragcalc.html
3600 lb. vehicle weight, 150 HP, 5000 RPM through the lights, 32"
tire diameter. The calculator said 16.06 E.T. @ 81.21 mph. It
also recommended a 5.86:1 gear ratio to make this happen. Not
clear to me if the HP is rated or at the rear wheels.
Bill Huff
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